<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
        <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :closable="false">
      </el-alert>
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
      label-width="100px" label-position="top">
      <el-tabs :tab-position="'left'"
      v-model="activeIndex" :before-leave="beforeTabLeave"
      @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price" type="number">
            <el-input v-model="addForm.goods_price"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight" type="number">
            <el-input v-model="addForm.goods_weight"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number" type="number">
            <el-input v-model="addForm.goods_number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader
            v-model="addForm.goods_cat"
            :options="catelist"
            :props="{ expandTrigger: 'hover' ,...cateProps}"
            @change="handleChange"></el-cascader>
          </el-form-item>
          
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <el-button type="primary" @click="resetManyTableData">重置参数</el-button>
          <!-- 渲染表单的item项 -->
          <el-form-item v-for="(item, i) in manyTableData" 
          :key="item.attr_id" :label="item.attr_name">
            <!-- 复选框组 -->
             <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox v-for="(cb, i) in item.attr_vals"
              :key="i" :label="cb" border @change="changeStatus">
              </el-checkbox>
             </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item v-for="item in onlyTableData"
          :key="item.attr_id" :label="item.attr_name">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action表示图片要上传到的后台api地址
                on-preview 预览 -->
          <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove"
            list-type="picture"
            :headers="headerObj"
            :on-success="handleSuccess">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器组件 -->
          <quill-editor v-model="addForm.goods_introduce">

          </quill-editor>
          <!-- 添加商品的按钮 -->
          <el-button type="success" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" style="width:100%">
    </el-dialog>
  </div>
</template>

<script>
// 导入lodsh深度拷贝依赖
import _ from 'lodash'
export default {
  name: '',
  data () {
    return {
      activeIndex:'0',
      // 添加商品的表单对象
      addForm:{
        goods_name:'',
        goods_cat:[],
        goods_price:0,
        goods_number:0,
        goods_weight:0,
        // 商品详情描述
        goods_introduce:'',
        pics:[],
        attrs:[],
      },
      addFormRules:{
        goods_name:[{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price:[{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight:[{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number:[{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat:[{ required: true, message: '请选择商品分类', trigger: 'blur'}],

      },
      catelist:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 动态参数列表数据
      manyTableData:[],
      temparams:[],
      // 静态属性
      onlyTableData:[],
      // 上传图片的url地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      // 图片的绝对路径
      previewPath:'',
      previewVisible:false,
    };
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList(){
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) return this.$message.error('获取分类信息失败')
      this.catelist = res.data
    },
    // 级联选择器选中项变化事件
    handleChange(){
      if(this.addForm.goods_cat.length !== 3){
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave(activeName,oldActiveName){
      if(oldActiveName === '0' && this.addForm.goods_cat.length!==3){
        this.$message.error('请选择商品分类')
        return false
        
      }
    },
    async tabClicked(){
      // 访问的是动态参数面板
      if(this.activeIndex === '1'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params: {sel:'many'}})
        if(res.meta.status !== 200) return this.$message.error('获取动态参数列表失败')
        res.data.forEach(item => {
          item.attr_vals =  item.attr_vals.length === 0 ?
          [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }else if(this.activeIndex === '2'){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params: {sel:'only'}})
         if(res.meta.status !== 200) return this.$message.error('获取静态属性列表失败')
         this.onlyTableData = res.data
      }
    },
    // 处理图片预览事件
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file){
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中找到图片对应的索引值
      const i = this.addForm.pics.findIndex(item => item.pic === filePath)
      // 3.调用数组的splice方法，把图片对象移除
      this.addForm.pics.splice(i,1)
    },
    // 监听图片上传成功的事件(response结果对象)
      handleSuccess(response){
        // 1.拼接得到一个图片信息对象
        const picInfo = { pic:
        response.data.tmp_path }
        // 2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
      },
      add(){
        this.$refs.addFormRef.validate(async valid => {
            if(!valid) {
              return this.$message.error('请完善商品信息')
            }
            // 执行添加请求
            // lodsh 深度拷贝 不影响原属性
            const form = _.cloneDeep(this.addForm)
            form.goods_cat = form.goods_cat.join(',')
            // 处理动态参数和静态属性
            this.manyTableData.forEach(item => {
              const newInfo = {
                attr_id: item.attr_id,
                attr_value: item.attr_vals.join(' ')
              }
              this.addForm.attrs.push(newInfo)
            })
            this.onlyTableData.forEach(item => {
            const newInfo ={
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs

          // 发起请求添加商品,商品的，名称必须是唯一的
          const {data:res} = await this.$http.post('goods', form)
          if(res.meta.status !== 201) return this.$message.error(res.meta.msg)
          
          this.$message.success('添加商品成功')
          this.$router.push('/goods')
          }
        )
      },
      async resetManyTableData(){
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params: {sel:'many'}})
        if(res.meta.status !== 200) return this.$message.error('获取动态参数列表失败')
        res.data.forEach(item => {
          item.attr_vals =  item.attr_vals.length === 0 ?
          [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      },
      changeStatus(){
        this.$message.success('取消参数成功')
      }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3){
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }

}

</script>
<style lang='less' scoped>
.el-steps{
  margin: 20px 0;
}
/deep/.el-step__title{
  font-size: 13px !important;
}
.el-checkbox{
  margin: 5px 10px 0 0 !important;
}
.el-button{
  margin-top: 20px;
  margin-bottom: 15px;
}
</style>